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Notes: Types of Dominance 1. Simple Dominance: One gene is dominant over the other. The recessive gene is hidden and not expressed. Example- tongue rolling Rolling tongue (R) is dominant to unable to roll tongue (r) 2. Incomplete Dominance: Neither allele is dominant over the other. The heterozygous offspring will be a blend of the two homozygous parents. Example- flower color in snapdragons RR=red flowers Rr=pink flowers rr=white flowers Example- hair texture in humans HH=curly hair Hh=wavy hair hh=straight hair 3. Codominance: Both alleles are fully expressed when in the heterozygous form. Example- chicken feathers BB=only black feathers BW=black and white feathers on the same chicken WW=only white feathers Example- Human Blood Types In humans, the allele for type A blood (IA) and the allele for type B blood (IB) are codominant. O (i) is recessive to both A and B. Phenotypes Type A Type B Type AB Type O Genotypes IA IA or IA i IB IB or IB i IA IB ii